Malicious PDF — malware analysis report

Static analysis result for SHA-256 2870d3fd3ce73729…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 06:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56e072c749c25d57fc4adaac8493194a SHA-1: 15e262ec984101d18aaef841d791492916e0c042 SHA-256: 2870d3fd3ce737290b2fd3cd18a21e31234174817ea0d9d97bce70e311d7732a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=how+happy+you+make+me+feel+quotes PDF link annotation
    • http://kufafukedexepix.mygamesonline.org/xomewubu.pdfIn PDF document text
    • http://dkmz1.club/62795308219if89x.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/nokuvojobevelenituxu.pdfIn PDF document text
    • http://allfreebets.ru/ducati_monster_2021_price_canadaw0x7m.pdfIn PDF document text
    • http://razvivatel.blog/804933415223stdu.pdfIn PDF document text
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/zezozudonire.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/lobotar.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/jufus-tadeta-zifazinin-kowotogetusa.pdfIn PDF document text
    • http://luminar2-download.xyz/wususimiz435n1.pdfIn PDF document text
    • http://xrootunited.com/anime_twist_apke7wxh.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/30740769615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/password_reset_disk_software_free.pdfIn PDF document text
    • http://xokifenutotumu.epizy.com/harris_dust_sheet_roll.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/what_is_the_ground-state_electron_configuration_expected_for_sulfur.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/toto_toilet_seat_replacement_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/meningitis_por_staphylococcus_aureus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 5388 bytes
SHA-256: 55bdfb8a360da3fc7a86bfe0c0860183d5be4602b066625abd1e6dea687c5181
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 10256 bytes
SHA-256: 164f369ada57d2072d9990fe49c0253d3b06976a112f92f8a540e4c30ab7d9d6

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